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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c2593e091a863d47a78f63a34232cd413cc0d595b34fafcf1301b59d53b5d2' 
  AND token = 'bwaOViDl8CSNf47ZnwrZe36aS4aNCe7h9gZmK9p71A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}